Hi,
find_object is not a valid function. We have find_item which I think is what you want to use. You can check the logs in Clarisse to check SeExpr compilation errors. If you try using find_object, the error is "Function find_object has no definition".
You can check our documentation. It lists all the functions available. The one you want (find_item) is documented here:
https://clarissewiki.com/4.0/constant-and-functions-referen.html. And in its doc, it's stated that the first parameter follow the rules for Groups, which is also documented here:
https://clarissewiki.com/4.0/rule_based_inclusion_exclusion.html and that the second parameter is a class name. And "path_tracer" is not a class name. Class names in Clarisse always use "ThisTypeOfNotation". You want "CameraPerspective" and "RendererRaytracer" (it's in the "Type" column of the Browser view)
Hope this helps.
Regards,
Damien.